Rear windscreen heater interferes with DAB radio

[Unclecuddles]

One for the new autumn season, when I switch my rear windscreen heater on, the radio cuts out completely. Turn it off and the radio comes back on. When I turn the heater on I can hear a click coming from the glove compartment (like a relay switch).

Anyway, it’s no big deal. My lease is up in a week! Just waiting on delivery of a Kia EV6.